Update cv3/program.c

cv3/program.c

@@ -91,7 +91,7 @@ int read(struct stack *s) {
                     case '*': result = a * b; break;
                     case '/':
                         if (b == 0) {
-                            printf("no input\n");
+                            printf("division by zero\n");
                             exit(1); // Exit on division by zero
                         }
                         result = a / b;